DateTimeZoneHandling setting

public class Flight
{
    public string Destination { get; set; }
    public DateTime DepartureDate { get; set; }
    public DateTime DepartureDateUtc { get; set; }
    public DateTime DepartureDateLocal { get; set; }
    public TimeSpan Duration { get; set; }
}

Flight flight = new Flight
{
    Destination = "Dubai",
    DepartureDate = new DateTime(2013, 1, 21, 0, 0, 0, DateTimeKind.Unspecified),
    DepartureDateUtc = new DateTime(2013, 1, 21, 0, 0, 0, DateTimeKind.Utc),
    DepartureDateLocal = new DateTime(2013, 1, 21, 0, 0, 0, DateTimeKind.Local),
    Duration = TimeSpan.FromHours(5.5)
};

string jsonWithRoundtripTimeZone = JsonConvert.SerializeObject(flight, Formatting.Indented, new JsonSerializerSettings
{
    DateTimeZoneHandling = DateTimeZoneHandling.RoundtripKind
});

Console.WriteLine(jsonWithRoundtripTimeZone);
// {
//   "Destination": "Dubai",
//   "DepartureDate": "2013-01-21T00:00:00",
//   "DepartureDateUtc": "2013-01-21T00:00:00Z",
//   "DepartureDateLocal": "2013-01-21T00:00:00+01:00",
//   "Duration": "05:30:00"
// }

string jsonWithLocalTimeZone = JsonConvert.SerializeObject(flight, Formatting.Indented, new JsonSerializerSettings
{
    DateTimeZoneHandling = DateTimeZoneHandling.Local
});

Console.WriteLine(jsonWithLocalTimeZone);
// {
//   "Destination": "Dubai",
//   "DepartureDate": "2013-01-21T00:00:00+01:00",
//   "DepartureDateUtc": "2013-01-21T01:00:00+01:00",
//   "DepartureDateLocal": "2013-01-21T00:00:00+01:00",
//   "Duration": "05:30:00"
// }

string jsonWithUtcTimeZone = JsonConvert.SerializeObject(flight, Formatting.Indented, new JsonSerializerSettings
{
    DateTimeZoneHandling = DateTimeZoneHandling.Utc
});

Console.WriteLine(jsonWithUtcTimeZone);
// {
//   "Destination": "Dubai",
//   "DepartureDate": "2013-01-21T00:00:00Z",
//   "DepartureDateUtc": "2013-01-21T00:00:00Z",
//   "DepartureDateLocal": "2013-01-20T23:00:00Z",
//   "Duration": "05:30:00"
// }

string jsonWithUnspecifiedTimeZone = JsonConvert.SerializeObject(flight, Formatting.Indented, new JsonSerializerSettings
{
    DateTimeZoneHandling = DateTimeZoneHandling.Unspecified
});

Console.WriteLine(jsonWithUnspecifiedTimeZone);
// {
//   "Destination": "Dubai",
//   "DepartureDate": "2013-01-21T00:00:00",
//   "DepartureDateUtc": "2013-01-21T00:00:00",
//   "DepartureDateLocal": "2013-01-21T00:00:00",
//   "Duration": "05:30:00"
// }